I've had the same problem, and I'm only able to type this by manually typing in the url to this page.
if anyone wants to know, its newreply.php?do=newreply&t=*****
the **** is the thread number.
so yea, 4 hours of white screens, not the best thing ever.
and I hope this posts.
yep, so this is all working nice, and everything works except the view of the threads. I hope my discovery of replies like this will further research into prevent white screens.